Amendments and Corrections

Abstract

10.1093/biomet/93.2.411 Arising from an omitted term in a calculation in the Appendix, variance formulae in the paper should be adjusted. In particular, the constants in the numerators of equations (2·4) and (2·15) should be 6 rather than 18. Variances are, however, still higher than in the case of least-squares estimators. The changes are implied by the following corrections to the Appendix. On p. 423, 2 c δΔ′ cos (ω ( k ) ) should be included within braces on lines 11 and 17, and 2 c δΔ′ sin (ω ( k ) ) should be added within braces on lines 12 and 18, leading to the extra term 2 cm −3/2 {Δ′ sin (ω ( k ) )γ sin ( k ) + Δ′ cos (ω ( k ) )γ cos ( k ) } on line 21. We are grateful to Barry Quinn for drawing our attention to this error.